Boring-machine



P. BOSCH.

BORING MACHINE.

APPLICATION FILED JULY 18, 1919.

Patented Apr. 5, 1921.

, I!) lIlll-Illlllllilll nun-"Immin firm UNTED STATES POMPEIN BOSCH, OF ELGIN, ILLINOIS.

nonme-maonmn.

Application filed July 18, 1919. Serial No. 811,781.

To all wlzom it may concern.

Be it known that I, POMPEIN Boson, a citizen of the Republic of Hungary, residing at El in, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Boring-Machines, of which the following is a specification.

My invention relates to boring machines by the use of which engine cylin ers can be rebored without removal of the crank shaft and without taking the cylinder block out of its bearings in the frame of an automobile. The primary object of the invention is the provision of an improved machine of this kind, easily centered and placed in position for boring, and so constructed and arranged that those operating parts normallyworking within the cylin er to be bored may, during the process of boring, be quickly removed from the cylinder to permit inspection of the work. Another object lies in the provision of an improved tool holding device whereby the cutting tool of the machine may be held very rigidly to its work and may also be quickly advanced toward or withdrawn from the work. In connection with the last named object, it is also my intention to provide a device for boring machines whereby the tool may be adjusted toward or from the work through extremely small distances andwith great accuracy. further object is to provide an improved form of connection between a tool holder and the device whereby the same is actuated. A further object is to devise a very compact boring machine.

Other objects and advantages of the invention will appear from the following description, taken in conjunction with the accompanying drawings which form apart of this specification and illustrate the preferred embodiment of the invention.

In the drawings:

Figure 1 is a section taken axially through a two-cylinder gas engine casting, illustrating the present invention mounted in operative position on the casting and partially sectioned in approximately the plane defined by the axes of the casting cylinders.

Fig. 2 is a section of a portion of the invention taken on line 2-2 of Fig. 1, omitting the cylinder casting.

Fig. 3 is a view in perspective of a catch plate forming a part of the invention.

Fig. 4 is a fragmentary bottom plan view of the preferred form of tool holder illustrating the device whereby the tool is rigidly held to its work, quickly advanced to and withdrawn from the same, and adjusted with respect to the work through very short distancesand with great accuracy.

Fig. 5 is a section taken approximately on line.5-5 of Fig. 4.

Reference numeral 10 indicates generally a cylinder castin for a gas engine comprisng piston cylin ers 11 and 12, the present invention being shown in Fig. 1 positioned for boring cylinder 11. The frame of the present invention is adapted to be bolted to the cylinder casting by means of any suitable number of machine bolts 13, which engage the tapped holes always rovided for the bolting of the cylinder hea s to the cylinder. This frame comprises a frame plate 14 overlying cylinder 12 and formed integrall with a de ending post 15 which is rigid y positioned axially within cylinder 12 and projects below the bottom of the latter. An arm, 16,is bolted upon the top of frame plate 14 by bolts '17 which traverse holes 18 formed in the arm; these holes being of greater diameter than that of the bolts 17, so that arm 16 may be shifted horizontally to cause its tool bearing extremity 19 to be accurately centered with respect to cylinder 11 over which it stands. The bottom surface 20 of post 15 defines a plane standing at right angles to the parallel axes of cylinders 11 and 12, and a supporting plate 21 is rigidly bolted against the surface 20. Plate 21 is held against post 15 by a machine bolt 22 which passes through a hole 23 of greater diameter than the bolt, so that the plate. may have its free extremity 24 accurately positioned concentric with the axis of cylinder 11. I

The extremity 19 of arm 16 forms the Specification of Letters Patent. Patented Apr, 5, 1921.

upper bearing for a tool shaft 25, the lower end of which bears in the extremity 24 of the supporting plate 2 1. For reasons which will be obvious from the further descrip-- tion the extremities 19 and 24 are spaced respectively above and below the upper and lower ends of the cylinder to be bored. The upper end of shaft 25 is enlarged to form a head 26 which revolves upon the top of arm 16. The head 26 is provided with a peripheral channel 27 which is engaged by a finger 28 bolted to the arm 16. Fixed in any suitable manner to head 26 are radiating handles 29 by means of which the tool shaft 25 is rotated. Finger 28 fits slidably within channel 27 and holds the head 26 against arm 16. By loosening the bolt 31 which holds the finger to arm 16, the finger may be turned out of channel 27 so that it forms no impediment to'the withdrawal of tool shaft 25 from its bearings. Slidabl and rotatably mounted upon the too'l sha areupper and-lower frusto-conical centering disks 32 and 33 respectively, the upper disk 32 resting by gravity in the upper end of cylinder 11, and the lower. disk 33 being held in the lower end of that cylinder by helical spring 34 which is interposed between the bottom of the disk and the top of sfipporting plate 21 and surrounds the tool s aft The tool shaft 25 is provided with a lontudinal channel 35 which opens inwardly rom its outer surface and extends parallel with its axis. A feed screw 36 is positioned in channel 35 and is journaled at its u per end in the head 26. The upper end 0 the feed screw extends slightl above the head 26. and is there provide with the hand crank 37. The lower end surface of tool shaft 25 defines a 'plane standing at rightangles to the tool shaft and the axis of cylinder 11, the tool shaft protruding slight-1y below the bottom of supporting plate 21,-

as seen in Fig. 1. A short boss 38 is formed on the bottom of supporting plate 21 andprojects below the as does the tool sha 25, the bottom surface of the boss lying in a common plane with,

from the bottom surface of boss 38 -up-' wardly into the supporting plate 21, the

head of this bolt being spaced-below the bottom surface of the boss. slide between the head of bolt 39 and boss 38 and to oscillate with respect to the bolt, is a supporting bar 41 in the free extremity 42 of which is journaled the reduced lower end 43 of the feed screw 36. The shank of bolt 39 passes through an elongated slot 44 formed in the supporting bar. screw 36 is eccentrlcally positioned in the tool shaft 25 and is carried bodily in an annular path during the rotation of the lat ter. The free extremity 42 of thesupporting bar 41 follows this annular path, the bar oscillating slightly about bolt 39 and sliding smoothly in its seat between the head of the bolt and boss 38. Thus the supporting bar 41 forms a support for the lower end of the feed screw 36.

ate the same distance- Mounted to The feed the tool holding channel.

and secured in a suitable channel provided in the tool carrier by means of an ordinary bolt 48this form of mounting being illustrated in Figs. 1 and'2. A squared recess 49 is provided in the tool carrier and intersects the upper and inner surfaces thereof. In this recess is snu 1y fitted a catch block 51, the latter being ormed with a mortise 52 which projects toward the center of the tool shaft 25 and fits a tenon provided in the outer side of feed nut 45. For the purpose of retaining the catch block in its recess, I provide upon the upper surface of the tool carrier an arcuate catch plate 53 which is provided near its ends with arcuate slots 54 en aged'by the shanks of ,a pair of bolts 55. uring the operation of the machine the position of the catch plate is that indicated by dotted lines in Fig. 2, a portion of the plate overlying the catch block. Near its center, however, the inner edge of the catch plate is intersected by an aperture 56 formed in the plate and of the same tween the feed nut and the tool carrier, the 5 bolts 55 are loosened and the catch plate is shifted to the full line position shown in Fig.2. In this position of the parts the aperture 56 of the catch plate registers above the recess 49 of the tool carrier and the tool carrier drops onto the top of the lower centering disk 33, following which the catch block 51 may be withdrawn from its tenonand mortise connection with the feed nut 45; and the toolshaft 25, feed screw 36, and feed nut 45, may be drawn upwardly out of the frame and cylinder, after the removal of finger 28 from channel 27.

The preferred form of tool holding device and tool are shown in Figs. 4 and 5 on a scale enlarged as respects Fig. 1. In

these figures the tool carrier 57 is identical with the tool carrier 46 of Figs. 1 and 2 except as respects the tool holding portion thereof. In this portion of the carrier 57 the tool holding channel which intersects the lower and outer surfaces of'the carrier terminates at its inner end in a cylindrical chamber 58 which extends slightly higher into the metal of the carrier than the top of An adjusting plate 59 rotatively fits the upper portion of chamber 58 and carries an upstanding shank 61 which is positioned concentric with the plate and recess, and extends upwardly through the plate, its upper extremity 62 being squared for engagement by a wrench.

To hold the adjusting plate and its shank in position a collar 63 is secured to the shank by a pin 64 and bears upon the upper surface of the tool carrier 57. The lower side of the adjusting plate 59 is cut away to form a spiral adjusting rib 65, this rib engaging one or more arcuate slots 66 formed i in the bpper surface of the cutting tool 67.

By means of a bolt 68 mounted near the periphery of the carrier 57 and traversing a slot 69 formed in the tool, the latter is held up against the carrier. By loosening bolt 68, the tool 67 is released or movement in its channel radially of carrier 57, and such movement, either inwardly or outwardly, is very quickly accomplished by rotation of the adjusting rib 65. 'Under normal working conditions any adjustments required will necessitate movement of the tool 67 through a very short distancefand it is obvious that, because of the spiral character of the adjusting rib this slight adjustment can be accomplished with great accuracy. Measured along any given radius of adjusting plate 59 the convolutions of the adjusting rib are equally spaced from each other; the pieces of metal formed in tool67 between the arcuate slots 66 are of such thick-' ness as to fit snugly within the spaces between these convolutions; hence the stresses set uplongitudinally of the tool during its cutting action are resisted not alone by bolt 68 but by the resistance of at least two of the convolutions of the adjusting rib as well. To make this resistance maximum the center of the tool holding channel lies along a radius of the adiusting plate 59.

In the operation of the invention the frame plate 14 and post 15 are first rigidly bolted in place following which the frame arm 16 is loosely positioned on the frame plate with the bolts 17 set in their slots but not tightened. In a similar manner a supporting plate 21 is loosely attached to the bottom of post 15. The lower centering disk 33 is now positioned in the lower end of cylinder 11 and spring 34 set in place. The upper centering disk 32 is now held up below the extremity 19 of arm 16 and the tool carrier-46 or 57 as the case may be is held below the disk. With the parts so disposed, the tool shaft 25, carrying feed screw 36 .and feed nut 45, is passed downwardly through its bearing in arm 16; the upper disk 32; the tool carrier 46; the lower disk 33; spring 34, and the extremity 24 of shift plate 21. By rotation of hand crank 37 and feed screw 36 the feed nut is brought to a position slightly above the level at which the tool carrier is being held and the mortise 52 of catch block 51 is fitted into its tenon in the' nut. The feed shaft is now rotated to carry the catch block downwardly into its aperture 49 in the carrier, following which the catch plate 53 is shifted into the dotted line position of Fig. 2 to' bind the catch block in the carrier. By rotation of the feed screw the carrier is now lowered into cylinder 11 and the tool shaft 25 accurately centered in this cylinder by means of the disks 32 and 33, this centering action resulting in such shifting Of frame16 and supporting plate 21 as to finally position their tool shaft bearings concentric with the axis of the cylinder. The bolts 17 and 22 are now tightened, the lower end 43 of the feed screw having first been located in position in supporting bar 41. The finger 28 is now swung into its channel 27 in the head of the tool shaft and bolt 31 is tightened. Crank 37 is now rotated to raise the tool carrier above the cylinder casting, in which'position the tool-47 or 67 as the case may beis set in .its channel in the carrier and adjusted radially thereof to make the desired cut in the bore of the cylinder. By means of crank 37 the tool is now lowered to the top of the cylinder upon which it begins its work as the operator, grasping handles 29, rotates the tool shaft. The rotative power of the tool shaft is transmitted from one side of channel 35 to nut 45, and thence throiwh mortise 52 and catch block 51 to the tool carrier. As it becomes necessary to lower the tool, the operator feeds the carrier downwardly by rotation of crank 37 and feed screw 36. It is often necessary, before acvlindcr is completely bored, to remove the boring tool and inspect the work. For the purpose of this inspection, my invention provides for very quickly clearing the cylinder, it being necessary only to swing finger 28 out of channel 27 and shift the catch plate 53 to the full line position of Fig. 2, following which the tool shaft 25, feed screw 36, tool carrier 46, and upper disk 32 may be instantly removed from the cylinder casting.

While I have illustrated and described the preferred embodiment of the invention, it will be obvious that one skilled in the art may make modifications thereof without departing from the spirit of the invention; I

wish therefore not to be restricted to the precise embodiment shown, except in so far as the same is limited in the appended claims.

I claim:

1. A boring machine, embodying a rotatable. tool shaft, a feed screw rotatable with the shaft and with respect thereto, a tool carrier slidably mounted upon the tool shaft and rotatable therewith, a nut movable upon the feed screw, said tool carrierhaving a recess opening through the face thereof, an element separate from and interposed between the nut and tool carrier, said element being freely detachable from the nut while the latter is upon the screw, and also being removably seated in the said recess, and a catch plate movably mounted upon the tool carrier and adapted to be moved across the said recess and over the said element wherebythe said element will be locked in operative position and against detachment from the nut and tool carrier.

- 2. In a boring machine, the combination new" ' said shaft, a

with a suitable frame, of a longitudinally channeled tool shaft journaled therein, a feed-screw rotatably mounted in the channel of the tool-shaft and rotatable bodily with feed nut travelin on the feed-screw and slidably fittin sai channel,

a recessed tool-carrier slidab y mounted on removably fitthe tool-shaft, a catch block ting the recess of the tool-earner and releasabl joined to said feed nut by a mortise forme on the catch block and engaging a tenon rovided in the nut, and a catch'p ate secure upon the carrier and normally overlying said catch block to hold the latter in its recess, said catch plate being shiftable from above the catch block to release the latter from the tool carrier.

3. In a boring machine, the combination of a frame comprising an arm arranged to overlie a cylinder to be bored and to stand spaced above the same, a tool shaft depending from a tool shaft bearing provlded in the arm, a bearing extending over and spaced from the other end of the cylinder and in which latter bearing the other end of the shaft is journaled for free removal, an enlarged peripherally channeled head on the tool shaft bearin on the top of the arm to support the sha t, a retaining finger for maintaining the shaft in its bearings, said finger being fastened to the arm and movable into and out of said peripheral channel, and a tool carrier releasably connected to the tool shaft below said arm for rotation with the shaft.

4. In a boring machine, the combination of a frame comprising an arm arranged to overlie a cylinder to be bored and to stand spaced above the same, a longitudinally channeled tool-shaft depending from a toolshaft bearing providedv in the arm, a feedscrew rotatably mounted in the channel of the tool shaft and rotatable bodily with saidshaft a feed nut traveling on the feed screw and slidably fittin said longitudinal channel, a tool carrier sli ably mounted on the tool shaft below said frame arm, releasable connecting means whereby the tool carrier is joined to the feed nut for movement therewith, a bearing extending over and spaced from the other end of the cylinder and in which latter bearing the other end of the shaft is journaledfor free removal, an enlarged head on the tool-shaft bearin on the top of the frame arm to support t e toolshaft, and a device removably engaging said head and fastened to the frame arm to prevent axial movement of the tool-shaft.

5. A boring machine embodying a suitable frame, a tool shaft journaled therein, a feed screw mounted in the tool shaft for bodily movement therewith and for rotation therein, a tool carrier slidably mounted on the tool shaft, means whereby rotation of the tool shaft rotates the tool carrier about the axis of the tool shaft and rotation of the feed screw feeds the tool carrier along the tool shaft, and a slidable and oscillating bearing in which one end of the feed screw is journaled.

6. A boring machine embodying a supporting structure, a tool shaft, said struc: ture having spaced bearin s in which the ends of the shaft are journaled, a feed screw mounted in the shaft for bodily movement therewith and for rotation therein, a tool carrier slidably mounted on the tool shaft, means whereby the rotation of the tool shaft rotates the tool carrier about the axis of the tool shaft and rotation of the feed screw feeds the tool carrier along the tool shaft, means for rotating the feed screw, a bearing in which one end of the feed screw is journaled, and a bolt and slot connection between the bearing and the said supporting structure whereby the bearing will have a free movement to compensate the changes in position of the feed screw caused by the bodily movement of the feed screw.

In testimony whereof I have afiixed my signature.

POMPEIN BOSCH.- 

